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HL: Fachverband Halbleiterphysik

HL 8: Poster Session II

HL 8.2: Poster

Dienstag, 28. September 2021, 10:00–13:00, P

Examination of time-energy-entanglement on the biexciton-exciton-system under resonant two-photon driving via Franson interferometry — •Marcel Hohn, Matthias Kunz, Samir Bounouar, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, D-10623 Berlin, Germany

We investigate the degree of time-energy entanglement from the XX-X-system under resonant two-photon driving. The dressing of this "three-level ladder" system leads to new eigenstates and previous experiments showed correlated emission of paired photons with manipulatable time ordering of the cascade [1]. In addition, a recent theoretical treatment indicated possibilities and limitations for the visibility of two-photon interference using Franson interferometry [2]. We measured the degree of time-energy-entanglement of the emitted pairs by Franson interferometry and observed a strong dependence of the visibility on excitation power and detuning. In particular, our measurements show that the degraded energy time entanglement of the XX-X-system under off-resonant excitation can be enhanced via strictly resonant two-photon-excitation.

[1] S. Bounouar et al., Physical Review Letters 118 (2017).

[2] K. Barkemeyer et al., Physical Review A 103 (2021).